mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-31 12:30:06 +00:00
36d5e7d31b
reader doesn't handle them at all yet. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36363 91177308-0d34-0410-b5e6-96231b3b80d8
106 lines
3.7 KiB
C++
106 lines
3.7 KiB
C++
//===- BitCodes.h - Enum values for the bitcode format ----------*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file was developed by Chris Lattner and is distributed under
|
|
// the University of Illinois Open Source License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This header Bitcode enum values.
|
|
//
|
|
// The enum values defined in this file should be considered permanent. If
|
|
// new features are added, they should have values added at the end of the
|
|
// respective lists.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_BITCODE_BITCODES_H
|
|
#define LLVM_BITCODE_BITCODES_H
|
|
|
|
#include "llvm/ADT/SmallVector.h"
|
|
#include "llvm/Support/DataTypes.h"
|
|
#include <cassert>
|
|
|
|
namespace llvm {
|
|
namespace bitc {
|
|
enum StandardWidths {
|
|
BlockIDWidth = 8, // We use VBR-8 for block IDs.
|
|
CodeLenWidth = 4, // Codelen are VBR-4.
|
|
BlockSizeWidth = 32 // BlockSize up to 2^32 32-bit words = 32GB per block.
|
|
};
|
|
|
|
// The standard code namespace always has a way to exit a block, enter a
|
|
// nested block, define abbrevs, and define an unabbreviated record.
|
|
enum FixedCodes {
|
|
END_BLOCK = 0, // Must be zero to guarantee termination for broken bitcode.
|
|
ENTER_SUBBLOCK = 1,
|
|
|
|
/// DEFINE_ABBREV - Defines an abbrev for the current block. It consists
|
|
/// of a vbr5 for # operand infos. Each operand info is emitted with a
|
|
/// single bit to indicate if it is a literal encoding. If so, the value is
|
|
/// emitted with a vbr8. If not, the encoding is emitted as 3 bits followed
|
|
/// by the info value as a vbr5 if needed.
|
|
DEFINE_ABBREV = 2,
|
|
|
|
// UNABBREV_RECORDs are emitted with a vbr6 for the record code, followed by
|
|
// a vbr6 for the # operands, followed by vbr6's for each operand.
|
|
UNABBREV_RECORD = 3,
|
|
|
|
// This is not a code, this is a marker for the first abbrev assignment.
|
|
FIRST_ABBREV = 4
|
|
};
|
|
} // End bitc namespace
|
|
|
|
/// BitCodeAbbrevOp - This describes one or more operands in an abbreviation.
|
|
/// This is actually a union of two different things:
|
|
/// 1. It could be a literal integer value ("the operand is always 17").
|
|
/// 2. It could be an encoding specification ("this operand encoded like so").
|
|
///
|
|
class BitCodeAbbrevOp {
|
|
uint64_t Val; // A literal value or data for an encoding.
|
|
bool IsLiteral : 1; // Indicate whether this is a literal value or not.
|
|
unsigned Enc : 3; // The encoding to use.
|
|
public:
|
|
enum Encoding {
|
|
FixedWidth = 1, // A fixed with field, Val specifies number of bits.
|
|
VBR = 2 // A VBR field where Val specifies the width of each chunk.
|
|
};
|
|
|
|
BitCodeAbbrevOp(uint64_t V) : Val(V), IsLiteral(true) {}
|
|
BitCodeAbbrevOp(Encoding E, uint64_t Data)
|
|
: Val(Data), IsLiteral(false), Enc(E) {}
|
|
|
|
bool isLiteral() const { return IsLiteral; }
|
|
bool isEncoding() const { return !IsLiteral; }
|
|
|
|
// Accessors for literals.
|
|
uint64_t getLiteralValue() const { assert(isLiteral()); return Val; }
|
|
|
|
// Accessors for encoding info.
|
|
Encoding getEncoding() const { assert(isEncoding()); return (Encoding)Enc; }
|
|
uint64_t getEncodingData() const { assert(isEncoding()); return Val; }
|
|
|
|
bool hasEncodingData() const { return hasEncodingData(getEncoding()); }
|
|
static bool hasEncodingData(Encoding E) {
|
|
return true;
|
|
}
|
|
};
|
|
|
|
class BitCodeAbbrev {
|
|
SmallVector<BitCodeAbbrevOp, 8> OperandList;
|
|
public:
|
|
|
|
unsigned getNumOperandInfos() const { return OperandList.size(); }
|
|
const BitCodeAbbrevOp &getOperandInfo(unsigned N) const {
|
|
return OperandList[N];
|
|
}
|
|
|
|
void Add(const BitCodeAbbrevOp &OpInfo) {
|
|
OperandList.push_back(OpInfo);
|
|
}
|
|
};
|
|
} // End llvm namespace
|
|
|
|
#endif
|